Experiment 21-Geometric Optics Part 1-Parallax (set up) Draw one - - PowerPoint PPT Presentation

Experiment 21-Geometric Optics

Part 1-Parallax (set up)

• Draw one line down the

middle of the long side

• f the paper
• Draw a line

perpendicular to the first line along the short side of the paper

• Place the mirror along

the short line

• Place a pin anywhere

along the normal in front of the mirror

Part 1-Parallax (perpendicular lines)

• Line up horizontal

line at bottom of protractor with already drawn line

• Perpendicular line

will be at 90o

Part 1-Parallax (method)

• Notice the reflection of

the first pin in the mirror. THIS IS OBJECT 1

• Place a second pin on the

normal behind the mirror. THIS IS OBJECT 2

• Look to the left (or right)
• f the closer pin
• At first the reflection and

the second pin you placed won’t line up

• Move object 2 so that it

lines up with object 1 (but keep object 2 along the normal)

Part 1-Parallax (method)

• Notice that the reflection
• f the front pin (object 1) is

lined up with the back pin (object 2)

• Good job 

Part 2-Reflection (set up)

• Draw two

perpendicular lines and place mirror along the short line (like part 1)

• Use the protractor

to draw a line between 25o-35o

• Place two pins

along this line and label them P1 and P2

Part 2-Reflection (method)

• Move your head so that

the reflection of both pins in the mirror align with

• ne another

Part 2-Reflection (method)

• Place down two pins so that they

line up with the reflections of P1 and P2

• Label these pins P3 and P4
• Draw a line connecting P3 and P4

Part 2-Reflection (method)

• Top down view of final result

Part 3-Refraction (set up)

• Place square plexiglass

in center of page

• Trace its outline

Part 3-Refraction (set up)

• Draw a normal line from the top

left corner of the outline (2 cm)

• Use the protractor to draw a line

between 25o-35o from the normal (like in part 3)

• Place two pins along this line and

label them P1 and P2

Part 3-Refraction (method)

• Place the square lens on

top of its outline

• Look through the bottom
• f the lens to find the

image of P1 and P2* * You can place a blank sheet

• f paper behind the lens to

make this easier for you

Part 3-Refraction (method)

• Move your head so

that the images of the two pins line up with one another

Part 3-Refraction (method)

• Place two pins down so

that they line up with the images of P1 and P2

• Label these new pins P3

and P4

Part 4-Total Internal Reflection (set up)

• Place triangle plexiglass

lens on paper and trace its

• utline

Part 4-Total Internal Reflection (set up)

• Draw a line perpendicular to

the left vertex of the long side on the lens (like in part 4) 1 cm from the vertex

• Place two pins along this

line and label them P1 and P2

Part 4-Total Internal Reflection (method)

• Look through the bottom of

the lens and line up the images of P1 and P2 (like in part 4)* *You can place a blank sheet of paper behind the lens to make this easier for you

Part 4-Total Internal Reflection (method)

• Place down two pins so that

they align with the images of P1 and P2 (like part 4)

• Label these two pins P3 and P4

Part 4-Total Internal Reflection (method)

• Draw a line connecting P3 and

P4 with the base of the lens

• utline
• Extend these lines through the

lens outline to the far side of the triangle

• Draw a line across the triangle

connecting the extensions of P1P2 and P3P4

• Top down view of the final

result